Derivative Positions (Detail) - USD ($) $ in Millions		Mar. 31, 2016		Dec. 31, 2015
Derivative Asset, Notional Amount		$ 143,941		$ 123,257
Derivative Liability, Notional Amount		117,939		124,755
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		5,826		4,465
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		5,411		4,428
Derivative, Fair Value, Amount Offset Against Collateral, Net		(3,484)		(2,916)
Derivative Liability, Fair Value, Amount Offset Against Collateral		(3,484)		(2,916)
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(607)		(397)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(1,273)		(1,048)
Derivative Assets	[1]	(1,735)		(1,152)
Derivative Liabilities	[2]	654		464
Other Trading [Member]
Derivative Assets		(1,735)		(1,152)
Derivative Liabilities		654		464
Credit Risk Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		6		6
Derivative Liability, Notional Amount		10	[3],[4]	9
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount		124,962	[5]	107,027
Derivative Asset, Fair Value, Gross Asset		5,443	[5]	4,321
Derivative Liability, Notional Amount		115,339	[5]	121,255
Derivative Liability, Fair Value, Gross Liability		5,409	[5]	4,417
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Mortgage Servicing Rights [Member]
Derivative Asset, Notional Amount		23,069	[5]	7,782	[4]
Derivative Asset, Fair Value, Gross Asset		602	[5]	198	[4]
Derivative Liability, Notional Amount		7,603	[5]	16,882	[4]
Derivative Liability, Fair Value, Gross Liability		373	[5]	98	[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		2,540	[5],[6]	4,309	[3],[4]
Derivative Asset, Fair Value, Gross Asset		8	[5],[6]	10	[3],[4]
Derivative Liability, Notional Amount		4,290	[5],[6]	2,520	[3],[4]
Derivative Liability, Fair Value, Gross Liability		25	[5],[6]	5	[3],[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount	[5]	5		15
Derivative Asset, Fair Value, Gross Asset		1	[5]	0
Derivative Liability, Notional Amount	[5]	50		40
Derivative Liability, Fair Value, Gross Liability	[5]	4		1
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		69,677	[5],[7]	67,426	[4],[8]
Derivative Asset, Fair Value, Gross Asset		2,714	[5],[7]	1,983	[4],[8]
Derivative Liability, Notional Amount		66,550	[5],[7]	68,125	[4],[8]
Derivative Liability, Fair Value, Gross Liability		2,479	[5],[7]	1,796	[4],[8]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Trading [Member]
Derivative Asset, Notional Amount		4,323	[5]	3,648	[4]
Derivative Asset, Fair Value, Gross Asset		131	[5]	127	[4]
Derivative Liability, Notional Amount		4,571	[5]	3,227	[4]
Derivative Liability, Fair Value, Gross Liability		127	[5]	122	[4]
Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount		10	[5]	0
Derivative Asset, Fair Value, Gross Asset		0		0
Derivative Liability, Notional Amount		445	[5]	175	[4]
Derivative Liability, Fair Value, Gross Liability		4	[5]	2	[4]
Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		2,248	[5],[9]	2,232	[4],[10]
Derivative Asset, Fair Value, Gross Asset		31	[5],[9]	57	[4],[10]
Derivative Liability, Notional Amount		2,437	[5],[9]	2,385	[4],[10]
Derivative Liability, Fair Value, Gross Liability		28	[5],[9]	54	[4],[10]
Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		19,486	[5],[7]	19,138	[4],[8]
Derivative Asset, Fair Value, Gross Asset		1,809	[5],[7]	1,812	[4],[8]
Derivative Liability, Notional Amount		28,680	[5],[7]	27,154	[4],[8]
Derivative Liability, Fair Value, Gross Liability		2,256	[5],[7]	2,222	[4],[8]
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount		3,011	[5],[11]	2,024	[4],[12]
Derivative Asset, Fair Value, Gross Asset		37	[5],[11]	21	[4],[12]
Derivative Liability, Notional Amount		126	[5],[11]	299	[4],[12]
Derivative Liability, Fair Value, Gross Liability		5	[5],[11]	6	[4],[12]
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		593	[5]	453	[4]
Derivative Asset, Fair Value, Gross Asset		110	[5]	113	[4]
Derivative Liability, Notional Amount		587	[5]	448	[4]
Derivative Liability, Fair Value, Gross Liability		108	[5]	111	[4]
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Adjustable Rate Loans [Member]
Derivative Asset, Notional Amount		18,250	[13]	14,500	[14]
Derivative Asset, Fair Value, Gross Asset		374	[13]	130	[14]
Derivative Liability, Notional Amount		0		2,900	[14]
Derivative Liability, Fair Value, Gross Liability		0		11	[14]
Fair Value Hedging | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		729	[15]	1,730	[16]
Derivative Asset, Fair Value, Gross Asset		9	[15]	14	[16]
Derivative Liability, Notional Amount		2,600	[15]	600	[16]
Derivative Liability, Fair Value, Gross Liability		2	[15]	0
Fair Value Hedging | Interest Rate Contract [Member] | Fixed Income Interest Rate [Member]
Derivative Asset, Notional Amount		700	[15]	1,700	[16]
Derivative Asset, Fair Value, Gross Asset		9	[15]	14	[16]
Derivative Liability, Notional Amount		2,600	[15]	600	[16]
Derivative Liability, Fair Value, Gross Liability		2	[15]	0
Fair Value Hedging | Interest Rate Contract [Member] | Brokered Time Deposits [Member]
Derivative Asset, Notional Amount		29	[15]	30	[16]
Derivative Asset, Fair Value, Gross Asset		0		0
Derivative Liability, Notional Amount		0		0
Derivative Liability, Fair Value, Gross Liability		0		0
Interest rate futures [Member] | Interest Rate Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount		546	[3],[4]	518
Interest rate futures [Member] | Interest Rate Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		$ 13,300		$ 12,600

[1] At March 31, 2016, $1.7 billion, net of $607 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2015, $1.2 billion, net of $397 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets.

[2] At March 31, 2016, $654 million, net of $1.3 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2015, $464 million, net of $1.0 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.

[3] Amount includes $518 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[4] See “Economic Hedging and Trading Activities” in this Note for further discussion.

[5] See “Economic Hedging and Trading Activities” in this Note for further discussion.

[6] Amount includes $546 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[7] Amounts include $13.3 billion of notional amounts related to interest rate futures and $91 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt.

[8] Amounts include $12.6 billion of notional amounts related to interest rate futures and $329 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt.

[9] Asset and liability amounts include $6 million and $10 million, respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor.

[10] Asset and liability amounts include $6 million and $9 million, respectively, of notional amounts from purchased and written interest rate swap risk participation agreements, whose notional is calculated as the notional of the interest rate swap participated adjusted by the relevant RWA conversion factor.

[11] Includes $49 million notional amount that is based on the number of Visa Class B shares, 3.2 million, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 12, “Guarantees” for additional information.

[12] Includes $49 million notional amount that is based on the number of Visa Class B shares, 3.2 million, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 12, “Guarantees” for additional information.

[13] See “Cash Flow Hedges” in this Note for further discussion.

[14] See “Cash Flow Hedges” in this Note for further discussion.

[15] See “Fair Value Hedges” in this Note for further discussion.

[16] See “Fair Value Hedges” in this Note for further discussion.